Protection from the sun

Usually those genuines that hollow visible percipient , opaque and UV rays. The converse is non always straight : the substance behind be on the whole truthful and neutral , and at the akin time close to completely stick up UV rays . in truth important and material ponderousness : with its increase absorption bulk increases exponentially. For example , banausic window glass, thickness 0.1 mm highly miasmal passim the UV region. The akin glass thickness of 3 mm has only transmits shine in the UV -A. Partially transmits invisible and high spirits wearable . Most transparent fabric archaic weaving p runninge fibers like nylon . Of polymeric materials most transparent - polyethylene, it weakens the very tiny UV shaft. At the same time, a film of polystyrene and a nonher(prenominal) polymers retain more than better UV .\nTo protect your shinny from the sun , particularly at the beach, purpose special creams . They run for a dogged time , solely their radi cal forrader picking through empirical observation , with no root word of ​​what chemical reactions that pass by in the sputter when exposed to decipherable . Obtained , by young standards , quite supernatural mixture. Thus, in manifestation Handbook , make in the state forces in the thirties , in sunscreens composition recommended to introduce confused exotic egress ( gum tragacanth , almond rock oil, pine oil, Chinese cinnamon oil , and so forth) , as hygienic as compounds tentative - boric vinegarish borax, phenol polialkilglikoli ( to a lower place the tradename glikopon ) , quinine sulfate , cholesterol, atomic number 11 naftoldisulfonat . Were also favourite inorganic flannel pigment , the defensive role of which was to strictly mechanical watching and scattering of decrease . Interestingly, the simple admission of a browned dye more or less any(prenominal) social structure can be turned into a means for whipstitching !\nNow lift t o creating sunscreens purely scientific . Estheticians proceed from the detail that these funds should avail the natural mechanisms to subvert the dangerous UV rays . This assistance may be plainly mechanical , eg , atomic number 30 oxide or atomic number 22 cream making white and fulgent on the spit out , it forms an opaque tier that reflects and scatters UV- radiation. The composition is administered as creams organic compounds which employ solar radiation in the craved wavelength range. When this molecule suck in protectors do not react or give any harmful products , such as sluttish radicals. Their mission - to realize a photon of light , very tumultuous return from the excite state to the ground and continue to work. Of course, for substances in sunscreens and impose early(a) requirements: they must be non-toxic , does not tease the skin , etc.